Drier



sept. 4, 1923. A 1,467.038

A. G. HU HN DRIER Original vFiled vMay 31 1919 .T5 Sheets-Sheet l Sept. 4, l923. 1,467,038

A. G. HUHN DRIER Original Filed May 3l 1919 3 Sheets-Sheecy [770e fam Patented Sept. 4, 1923.

UNITED SITE..

TUBING COMPANY, OF MINNEAPOLIS, MINNESOTA, A CORPORATION.

DRIER.

Application led May 31, 1919, Serial No. 300,813. Renewed February 1, 1923.

T all whom t may concern.'

Be it known that I, ALEX G. HUHN, a citizen of the United States, residing at Minneapolis, in the county `of Hennepin and State 0f Minnesota, have invented certain new and useful Improvement-s in Driers, of which the following is a specification. y

My invention relates to driers for various forms of material and particularly material which might have a tendency to cling to hot surfaces and become scorched or impaired thereby. It is an object of my invention to construct a drier which shall use in the largest measure the heat elements applied to the drier without injury to the product and which shall eect drying of the product with great dischargeV and high efiiciency. r I

The full objects of my invention will appear in connection with the detailed description thereof and are particularly pointed out in the claims.

In the drawings illustrating the application of my invention in one form,-

Fig. 1 is a longitudinal sectional view of the invention taken on line 1-1 of Fig. 2. Fig. 2 is a transverse sectional view taken on the line 2 2 of Fig. 2. Fig.- 3 is a transverse sectional View takenon the line 3-3`of Fig. 1.

The device embodies -a frame consisting of a front casting and rear casting 11 secured togetherby tie rods 12, 13 and 14, said tie rods being formed preferably as shown by the interior bolt members 15 and surrounding sleeves, or pipes, as clearly shown in Fig 3. The front lugs 16 and rear lugs 17 support the frame. The rearlugs 17 are provided with flanges 18 which, by means ofbolts 19 engaging a. pedestal 20, enable the frame to be adjusted at a desired angle to cause the parts to slope from the rear to the front.

The front member has a fmain wall' 21 provided with a circular opening 22 and bolted upon the main wall 21 is a drum member 23 having therein two chambers 24 and 25. A multiplicity of large pipes 26 are set in the inner wall of the chamber 25 opening directly into said chamber-, and a corresponding number of smaller 4pipes 28 passthrough the intermediate wall 29 which divides chambers 24 and 25. These smaller pipes extend within'they large pipes 26 and open at one end intoI chamber 24 and at the other end within the pipes 26, which pipes are closed by caps 80;y A heating medium, such as steam or liquid oil, is admitted to chamberl 24 through a pipe 31, from whence f it passes through the small pipes: 28 to the ends of the large pipes 26 `and baclrthrough the large pipes 26 into chamber. 25 from which saidheating medium is withdrawn bv means of pipe 32communicating with chainiber 25. It will beseen that all of the pipes are thus supported attheir forward Y I the drum 23. The cylinder-83 rotatably supported by rollers 34 at its rear end and rollers 35 Iat its front end', these rollers being rotatably mounted in lugs 17 fand 16 respec` tively. A pinion 36 meshes with anannular spur gear 87 secured around-the front end of the cylinder. The pinion 36 is keyed upon a shaft 38 which is journaled in one of the membersl. Also secured to the shaft 38 is a pulley 39. adaptedvto be driven by4 a belt 40. The interior ofthe cylinder 33 is provided with a plurality of flights 41 and a smaller cylinder 42 is concentrically mounted within the cylinder place bybrace. rods 43 secured to the two cylinders. The exterior yof the cylinder 42 is provided with a plurality of flights' 44 which cooperatewith the flights 41 to lift the grain or other materia-l as it is fed into' the annular space between the cylinders by a screw conveyor 45 which delivers into this space at the rear of the apparatus. Immediately after it has been dried' bypassing through the apparatus it is dischargedat the front into a spout 46 connected to the casting 10. To the inner surface ofthe rear casting 11 is secured a drum member 47 which carries a flange member 48 within which the rear end of the inner cylinder 42v rotatef. Some of 'the pipes 26 are sufficiently long to extend into the upper portion of the space within the drum 47 and a pipe 48 leads into thisspace to provide for the entrance of air which is drawn through the inner cylinder over the pipes and caused to be deflected alternately, upwardly and downwardly by upper. baffle plates 49 and lower baiiie plates 5,0 arranged in staggered relation, with their ends extending slightly beyond the axial line of the innercylinder, as indicated in Fig. 2. TheA airjwhich is drawn through the inner cylinder.v inr the manner justl described passes out of the forward end thereof into the annular y space 33 and held in' ends upon ico between the cylinders and passes back through the material which is being repeatedly lifted by the blades, as previously stated, and allowed to drop over the inner cylinder. The current or air through the apparatus is produced by a fan connected with a casing 5l in communication with the annular space between the cylinders at the rear.

The advantages of my improved drier are quite clearly pointed out in connection with the detailed description thereof. Any degree of heat which is desired may be obtained and yet the material operated upon will not be scorched or impaired, or even discolored. The heating pipes being entirely within the inner drum, the direct radiation of heat from such pipes is trans mitted to the walls of said inner drum, which in turn transmit the heat to the annular chamber which constitutes the drying area. heat and the air admitted through the inlet opening a8 becomes rapidly and uniformly heated. This air passes first through the discharge stream of material within the. heated chamber leading to the discharge passageway 46. The airv at that time is the hottest and the driest, and there-tore removes 'from the discharging material thev last desired amounts oimoisture. This air is constrained to pass through the annular drying chamber in a uniform heated stream and is at all times in contact with the double streams or falling material, that is the material falling from the 'liights in the outer drum upon the inner drum at the upper part ot the annular drying chamber, and material falling from flights on' the inner drum to the outer drum in the lower part of the annular drying chamber. There will also be more or less falling ot materialat the sides, so that substantially the entire annular chamber will be filled with falling material subjected to the draft ot heated air. Tt thus follows that tor the actual space within the drum a maximum amount of drying is eHected. The air inlet pipe a8 is preferably provided with a damper mechanism whereby the supply of air to the interior is accurately regulated. The mate` rial instead of being fed in by means ot a screw through the inlet pipe may be ted by any suitable means. The means herein shown is, however, of peculiar advantage where the material is moist or sticky or aggloi'nerated, as it insures the constant feed and insures the breaking up of the material before it reaches the heating mechanism. The arrangement for mounting the pipes within the drums it will be seen is very simple and enables the pipes readily to be removed if desired for repair or other reasons. Furthermore, the baffle plates i9 and have the effect of causing the air within For this reason there is no loss of the cylinder 42 to move alternately in trans'- verse direction across the lengths ot' the pipes and against the walls' ot cylinder 42, thus insuring maximum heating eii'ect upon the air and also upon the wall of cylinder 42. Thus a much more eiiicient heating` etifect upon the air can be obtained than if it traveled in a direct line longitudinally of the pipes.

l claim:

l. A drier comprising a casing which con stitutes a drying chamber, heating means surrounded by said chamber, means Jfor causing air to pass over said heating means and through said chamber, and means for feeding material to be treated into said chamber.

2. A drier comprising a rotating member having an annular drying chamber, heating means surrounded by said annular chamber, means tor causing air to pass over said heating means and through the annular chamber, and means for feeding material to be treated into the annular chamber.

3. A drier comprising a rotating member having an annular chamber and a central chamber surrounded by said annular chamber, a battery of heating pipes in said central chamber, means 'for admitting atmosn pheric air to the central chamber only at one end and for admitting air from said central chamber at its other end to the annular chamber, means 'for causing the air to move through said chambers and be discharged to atmosphere, and means for feed ing the material to be treated into the annular chamber.

4. A drier comprising a rotating member having an annular chamber and a central chamber surrounded by said annular chamber, a battery of heating pipes in said central chamber, means for causing a heating medium to circulate through all the pipes of said battery, means for admitting atmospheric air to the central chamber only at one end and 'for admitting air from said central chamber at its other end to the annular chamber, means tor causing the air to move through said chambers and be discharged to atmosphere, and means for feeding the material to be treated into the annular chamber.

5. A drier comprising a rotating member having an annular chamber, means for generating heat surrounded by said annular chamber, means for feeding material to be treated into said annular chamber, means holding said annular chamber at an angle to the horizontal whereby the material is caused to gravitate through the chamber as the member is rotated, and means :tor receiving material from the annular chamber and discharging it from the drier.

6. A drier comprising a pair of concentric drums held in fixed spaced relation so as to provide an annular chamber between said drums, means for rotating said drums, heating means within the inner drum, means for causing air to pass through the inner drum and over said heating means and thereafter through the annular chamber, and means for feeding material into the annular chamber.

7. A drier comprising a pair of concentric drums held in iixed spaced relation so as to provide an annular chamber between said drums, means for rotating said drums, means sealing said annular chamber from the interior of the inner drum at one end, means opening the annular chamber to the interior of the inner drum at the other end, means for admitting air to the inner drum at said sealed end, means for drawing air trom the annular chamber at said sealed end, heating means within the inner chamber, and means for feeding material into the annular chamber at said sealed end and for withdrawing said material from the annular chamber at the other end. y

8. A drier comprising a rotating member having an annular drying chamber and an `interior heating chamber, a battery of pipes in said heating chamber, means for admitting air to said heating chamber and drawing it through the same and thereafter through the annular chamber, means in the heating chamber for causing the air to move e alternately from one side to the other of the heating chamber transversely across the pipes, and means for feeding material to be treated into the annular chamber.

9. A drier comprising a rotating member having an annular drying chamber and an interior heating'chamber, a battery of pipes in said heating chamber, means for admitting air t0 said heating chamber and drawing it thro-ugh the same and thereafter through the annular chamber, a multiplicity of battle plates in the heating chamber eX- tending partl way across the. same and through which the pipes extend, said lates being in staggered relation to cause t e air within the heating chamber to move alternately from one side of the heating chamber to the other transversely across the pipes,

and means for feeding material to be treated into the annular chamber.

In testimony whereof I hereunto alix my signature.

ALEX G. HUHN. 

